From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page from a report detailing engine specifications and valve gear analysis.
| Identifier | ExFiles\Box 125\2\ scan0047 | |
| Date | 14th June 1929 guessed | |
| contd :- -2- Choke dia 1.187" Induction pipe uptake above choke 1.425" Induction ports on block 1.425" Inlet valve head dia. 1.725" Exhaust " " 1.600" Valve lift .312 Valve stem dia. .340 Length conn. rod 10 7/16" Ratio l/r 4.17'1 Valve areas at full lift : Engine. INLET. EXHAUST. sq.in. sq"/litre. sq.ins. sq"/litre. G.LV (3.00" bore) 1.44 2.77 1.335 2.56 Chrysler. 1.69 2.49 1.566 2.30 S.S. 2.56 2.00 2.29 1.79 For unit weights see at end of report. VALVE GEAR : Side valves are operated by mushroom tappets, and almost tangent-flanked cams. The tappets have tubular mild steel stems and welded in chilled cast iron heads. These are slightly eccentric from the cam, and have taken on a very fine finish where the cam rubs. The cast iron head on one tappet has broken inside the m.s. tube, and has been replaced. The total weight of one valve plus tappet, colla cotter, and 1/3 spring is 10.37 ozs. contd :- | ||